时间日期常用方法

from datetime import datetime, date, timedelta

def filter_time(time_format):
    # '2022-06-27T17:30:31.96+08:00' -> '1656322231000'
    if time_format:
        return str(int(datetime.strptime(time_format, "%Y-%m-%dT%H:%M:%S.%f%z").timestamp()))+"000"
    else:
        return ""

def get_today_date():
    return str(date.today())

def format_datetime_local(time_with_zone):
    d = datetime.fromisoformat(time_with_zone)+timedelta(hours=8)
    return d.isoformat(timespec='seconds', sep=" ").split('+')[0] 
    
def getNowFormat_e8():
    return (datetime.utcnow() + timedelta(hours=8)).isoformat(sep=' ',timespec='seconds')

def parse_datetime(time_format):
    # Jun  1 05:46:49 2022 GMT
    return datetime.strptime(time_format, '%b  %d %H:%M:%S %Y GMT') + timedelta(hours=8)
    
def get_timeformat_with_zone():
    t = (datetime.utcnow()+timedelta(hours=8)).isoformat(sep=" ",timespec="seconds")
    return f"{t} +0800"

def get_date_format():
    return date.today().isoformat()

def t_to_timeformat(t):
    # str to time_format
    t = int(t)/1000
    return datetime.fromtimestamp(t).isoformat(sep=" ",timespec="microseconds")
    
def get_yesterday_date_format():
    return (date.today()-timedelta(days=1)).strftime("%Y%m%d")

from datetime import datetime

def parse_timestamp(time_created):
    # time_created = "\/Date(1680604245507)\/"
    try:
        timestamp = datetime.fromtimestamp(int(re.search('\d+', time_created).group()) / 1000.0)\
            .isoformat(sep=" ", timespec='seconds')
        return timestamp
    except:
        return ''

import re
from dateutil import parser
from datetime import timezone, timedelta


def parse_time_string_1(time_string):
    # time_string = '2023-05-19T10:31:41.587456400Z'
    try:
        parsed_dt = parser.isoparse(time_string)
        tz = timezone(timedelta(hours=8)) # tz = datetime.now().astimezone().tzinfo
        local_dt = parsed_dt.astimezone(tz).strftime("%Y-%m-%d %H:%M:%S")
        return local_dt
    except ValueError:
        return ''

def get_parse_time_string(time_string):
    # time_string = 'The operating system is shutting down at system time 2023-05-19T10:31:41.587456400Z.'
    match = re.search(r'\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{9}Z', time_string)
    if match:
        time_string = match.group()
        local_dt = parse_time_string_1(time_string)
        return local_dt
    return ''

result = get_parse_time_string('The operating system is shutting down at system time 2023-05-19T10:31:41.587456400Z.')
print(result)

import re
from datetime import datetime, timezone, timedelta

def parse_time_string_0(time_string):
    # time_string = '2023-05-19T10:31:41.587456'
    utc_dt = datetime.strptime(time_string, '%Y-%m-%dT%H:%M:%S.%f').replace(tzinfo=timezone.utc)
    local_dt = utc_dt.astimezone(timezone(timedelta(hours=8))).strftime("%Y-%m-%d %H:%M:%S")
    return local_dt

def get_parse_time_string(time_string):
    # time_string = 'The operating system is shutting down at system time 2023-05-19T10:31:41.587456400Z.'
    match = re.search(r'\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{9}Z', time_string)
    if match:
        time_string = match.group()[:-4]
        local_dt = parse_time_string_0(time_string)
        return local_dt
    return ''

result = get_parse_time_string('The operating system is shutting down at system time 2023-05-19T10:31:41.587456400Z.')
print(result)